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Tuning PP750 O-ring list

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View attachment Orings - Artemis PP750.16055938381.1614572028.pdf

Found this list floating around a while back on the gta forums. Theres 2 orings on that list that will have to be bought of ebay forget which ones.
 
Im a bit confused another list from the web for the pp700sa has 

Part No./Cross Section/Inside Diameter

27 1.5mm X 5mm

34 1.5mm X 5mm

36 1.5mm X 8mm

8 1.5mm X 9mm

and so on...... WHAT IS THE PART NUMBER??? is the part number only specific to the place that you buy the orings from??? I should just ignore he "Part No." and concentrate on the (CS) x (ID) buna- n-70, is this correct???